Metal-working machine



P. R. HAHNEMANN.

METAL WORKING MACHINE.

APPLICATION FILED JUNE 1, 1920-.

1,406,004, Patented Feb. 7, 1922.

2 SHEETSSHEET l- P. R. HAHNEMANN.

METAL'WORKING MACHINE.

APPLICATION HLED sun: 1, 1920.

Patented Feb. 7, 1922.

2 SHEET$SHEET 2- UNITED STATES PATENT OFFICE.

PAUL n. HAHNEMANN, or sourmnerron, CONNECTICUT, AssrGnon 'ro rncx, snow& WILCOX COMPANY, 01? sournme'ron, connnc'ri'cur, A conromnon orCONNECTICUT.

METAL-WORKING MACHINE.

Specification of Letters Patent.

To all whom it may concern:

Be it known that I, PAUL R. HAHNnMnNN, a citizen of the UnitedStates,'and res1dent of Southington, county of Hartford, State ofConnecticut, have-invented certain new and useful Improvements inMetal-Working Machines, of which the following is a specification. y

Thisinvention relates to machines for use in working sheet metal, forinstance, rolling or curling sheets of metal into the form of a pipe orcylinder. p

The aim of the invention is to prov de 1n a machine of this sort certainnovel feaures of construction which features are of advantage in thatthey facilitate the removal of the sheet of metal fromthe mandrel onwhich itis shaped.

In the accompanying drawings: Fig. 1 is a front view of a machme inwhich one embodiment of the invention is incorporated, i

Fig. 2 is a left end view thereof, p v Fig. 8 is an elevationofthe'right :hand or operating end of the machine, the clamp for securingthe mandrel in position being shown by dotted lines in raised position,and Fig. 4: is a front View of vamachine of slightly differentconstruction which is especially adapted for heavi'er kinds of work, theposition which-the parts assume when the mandrel is raised beingindicated by dotted'lines. 1

Referring to the drawings, the frame of the machine is shown ascomprising a'pair of spaced standards or columns a connected by braces12. c is aroll (supported at its opposite ends as hereinafter described)onto which the sheets of metal are curled." For convenience, only, thisroll 0 will be referred to as the mandrel. The mandrel is cooperativelypositioned relative'to base rolls 0?, 6. At the operating end of themachine, the

. roll (Z carries a crank f and atthe other, or

left hand of the machine, the projecting gudgeons of the rolls 0, (Z,carry intermesh .ing gears i'so that upon operation of the crank theserolls will rotate in opposite directions. The sheet of, metal, shown indotted lines Fig. 3 and indicated by the letter X, is drawn in betweenthe rolls as indicated. The arrangement of the rolls may, of course, bevaried to suit requirements. The

, gudgeons of the rolls d, e, are supported in jection 17 on thestandard a.

bearing blocks 9 adjustable in any suitable manner as by meansof screws7t.

To remove the shaped sheet of metal from Patented Feb. 7-, 11 922.

about the mandrel 0, it is necessary to free .and raise one end'of themand-rel and to this feature the present invention is particularlydirected. In both of the embodiments herein illustrated, the mandrels 0are supported ina similar manner by the standards a. One

end-of the mandrel '0', preferably that end at the operating side ofthe-machine, is supported in a'quickly separable two-part bearvided inthe upper 'edge of-the standard a, and the other part 11 beingcariied bya lever w12 pivoted, as at v18, to the standard a. Pivoted, as "at 14,to the free end ofi'the lever 12 is a clamp 15 of somewhat hookedone'part 10 of'the bearing being preshape and having a'par't16 in theform of f a set screw which when the clamp is in looking positionengages the under face of a pro- The extent of piv'otal movement oftheclamp about its pivot 14 is limited by the engagement of the edge orshoulder 18 0f the clampa ainst an abutment 19 on the lever 12 and't eextent to which the lever can be thrown back out of operative positionis limited by the engagement of the'edge 20 of the lever againstshoulder 21 on the standard a, Withthis arrangement it will be seen thatbut one movement on the part of the operator'is necessary to swing theclamp out of clamping position and throw the bearing lever 12 backwardlywhen it is desired to release the ri ht hand gudgeon of the mandrel c.

' Vh'en the lever'is in raised positionwas shown in dotted lines, Fig.3, its center of gravity is but slightly back of a vertical line passingthrough the pivot '13 so that with practically no effort and with but avery slight movement" the operator may throw the clamp forward intoclamping position.

To perm1tthe mandrel 0 to be movedinto and out of operative position,the left hand gudgeon 22 thereof is Supported in a bearing block 23pivotedon a pin 24.

To facilitate the remoi al of the pipe or -cylinder of metal curledabout the mandrel 0, there is provided means for raising the right handend of the mandrel when the clamp is thrown back. In the embodimentshown in Figs 1 to 3, this means comprises a tension spring connected atits lower end to a fixed part or lug 26 and at its upper end to a ring27 positioned in an annular groove in the gudgeon 22.

In machines where heavier kinds of work are to be done, the mandrel isusually larger and heavier and such a machine is shown in F 4. In thisembodiment the means for raising the mandrel 0 is'in the form of asystem of levers and links preferably operable from theoperating side orend of the 1 machine.

Referring to this embodiment, upon the gudgeon 22 of the mandrel 0 is anarm 39 which is loose in that the gudgeon mayrotate independently of thearm but it is fixed against longitudinal movement on the gudgeon; .Thisarm is connected by a link 3l-to anarm 32 of a lever pivoted as at ;33to the standard a. The other arm'of this iv lever comprises-a rod 34preferably extending across the face ofvthe machine to the .operatingside thereof so that the operator 7 need not shift his position to raiseand lower i the mandrel 0. The end of the gudgeon of the rollglconstitutes a'stop against which the lever 32 engages when the mandrel ois raised, as shown in dotted lines. Preferably,

the rod 34 carries a weight 35, the avoirdupois of which is such thatlittle or no effort on the partof the operator-is required to raiseandlower the mandrel a;

. It will be seen from Fig.4 that when the rod 34 is lowered to raisethe mandrel 0, the

point of pivotal. connection between the link 31 and the arm 30 is movedpast dead center, that is slightly beyond the line passing through thepivot 33 and the pivotal connection between the lever 32 and the link31. .Thus,-after the mandrel ohas been raised, it will remain in raisedposition until the operator raises the rod 34 and'but a slight,moveme-nt of the rod is necessary to start ,the downward movement ofthe mandrel un- -der its own weight. 45

It isof course evident that my invention is susceptible of variousmodifications and changes whichare within thev spirit of the drelcooperating withsaid base roll, means for rotating said mandrel, meansfor detachably clamping one end of'said mandrel in' operative position,a pivoted bearing block supporting the other end of said man- 7 drel, anarm on said mandrel beyondsaid bearing block, a lever pivoted to theframe, and a link between said lever and arm, the

point of connection between said link and I arm being moved from oneside to slightly beyond the other side of a line passing through thepivot of said lever and the point'of connection between said lever andlink when said mandrel is raised.

2. In a machine of the character described, a frame, a base roll mountedtherein, a mandrel cooperating with said base roll, means for rotatingsaid mandrel, means for detachably clamping one end of said J mandrel inoperative position, a bearing block supporting the other end of saidman- 'drel forrocking movement, an arm on said mandrel beyond saidbearing block, a lever pivoted tosaid frame, and a link between saidlever and arm, the length of said lever between its pivotal point andits point of connection with said link being greater than the length ofsaid link between its respective points of connection with said leverandarm.

3. In a machine of the character described, a frame, a mandrel therein,a divid ed bearing supporting one end of said manvdrel and including abearing part pivoted to said frame, a clamp pivoted to the free end ofsaid bearing part and havingan integral which said clamp cooperates,interengaging means on said bearing part and frame for holding-said partwhen thrown into inoperative position slightly inclined to a verticalline passing through its axis, and interen- '90 handle, an abutment onsaid frame with a in meanson said clam and beariiw a: p a

part for holding the clamp with the handle in substantially longitudinalalinement with said bearing part when the latter is thrown intoinoperative position whereby said handle, when the bearing part is ininoperative position, may be readily grasped.

4. In a machine of the character e described, a frame, a mandreltherein, a divided bearing supporting one end of said mandrel andincluding a bearing part pivoted on said frame, a clamp pivoted to thefree end of said bearing I hooked-end, an abutment on said frame'havingits under face curved substantially concentric about the axis of theclamp' when said bearing part is in operative position, and anadjustable screw carried by the hooked end of said clamp and adapted forautomatic engagement withthe under face part and having a.

of said abutment, when said bearing part and clamp are thrown intooperative po-;

sition.

PAUL R. HAHNEMANNL

